I have a 550 gallon tank. I have a dozen red hook silver dollars and some plecos. At this point I need to add the cichlids. Outside the pike crenchila I will have central American fish. What do you think of these fish. I only want one of each genus Citrinellum, a petenia splendida snook, nandopsis grammodes or tetracanthus cuban,false red terror ex cichlasoma uropthalmus, one from parachromis friedrichsthalii,Loisellei,managensis, motaguensis. And a vieja zontas, melanura or argenteus.